[runtime] Turn ArgumentAccessStub into FastNewSloppyArgumentsStub.

src/full-codegen/x64/full-codegen-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/ast/scopes.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 250 matching lines @@
   if (arguments != NULL) {
     // Arguments object must be allocated after the context object, in
     // case the "arguments" or ".arguments" variables are in the context.
     Comment cmnt(masm_, "[ Allocate arguments object");
     if (!function_in_register) {
       __ movp(rdi, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
     }
     if (is_strict(language_mode()) || !has_simple_parameters()) {
       FastNewStrictArgumentsStub stub(isolate());
       __ CallStub(&stub);
+    } else if (literal()->has_duplicate_parameters()) {
+      __ Push(rdi);
+      __ CallRuntime(Runtime::kNewSloppyArguments_Generic);
     } else {
-      DCHECK(rdi.is(ArgumentsAccessNewDescriptor::function()));
-      // The receiver is just before the parameters on the caller's stack.
-      int num_parameters = info->scope()->num_parameters();
-      int offset = num_parameters * kPointerSize;
-      __ Move(ArgumentsAccessNewDescriptor::parameter_count(),
-              Smi::FromInt(num_parameters));
-      __ leap(ArgumentsAccessNewDescriptor::parameter_pointer(),
-              Operand(rbp, StandardFrameConstants::kCallerSPOffset + offset));
-
-      // Arguments to ArgumentsAccessStub:
-      //   function, parameter pointer, parameter count.
-      // The stub will rewrite parameter pointer and parameter count if the
-      // previous stack frame was an arguments adapter frame.
-      ArgumentsAccessStub::Type type = ArgumentsAccessStub::ComputeType(
-          literal()->has_duplicate_parameters());
-      ArgumentsAccessStub stub(isolate(), type);
+      FastNewSloppyArgumentsStub stub(isolate());
       __ CallStub(&stub);
     }
 
     SetVar(arguments, rax, rbx, rdx);
   }
 
   if (FLAG_trace) {
     __ CallRuntime(Runtime::kTraceEnter);
   }
 
@@ skipping 4221 matching lines @@
   DCHECK_EQ(isolate->builtins()->OsrAfterStackCheck()->entry(),
             Assembler::target_address_at(call_target_address,
                                          unoptimized_code));
   return OSR_AFTER_STACK_CHECK;
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64